99cad1044b
These are emitted by C compilers but also by the current development version of the go compiler with the dwarflocationlists flag.
52 lines
1.0 KiB
Go
52 lines
1.0 KiB
Go
// Package dwarfbuilder provides a way to build DWARF sections with
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// arbitrary contents.
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package dwarfbuilder
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import (
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"bytes"
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"debug/dwarf"
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"encoding/binary"
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"fmt"
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)
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type Builder struct {
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info bytes.Buffer
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loc bytes.Buffer
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abbrevs []tagDescr
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tagStack []*tagState
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}
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// New creates a new DWARF builder.
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func New() *Builder {
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b := &Builder{}
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b.info.Write([]byte{
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0x0, 0x0, 0x0, 0x0, // length
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0x4, 0x0, // version
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0x0, 0x0, 0x0, 0x0, // debug_abbrev_offset
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0x8, // address_size
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})
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b.TagOpen(dwarf.TagCompileUnit, "go")
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b.Attr(dwarf.AttrLanguage, uint8(22))
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return b
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}
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// Build closes b and returns all the dwarf sections.
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func (b *Builder) Build() (abbrev, aranges, frame, info, line, pubnames, ranges, str, loc []byte, err error) {
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b.TagClose()
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if len(b.tagStack) > 0 {
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err = fmt.Errorf("unbalanced TagOpen/TagClose %d", len(b.tagStack))
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return
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}
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abbrev = b.makeAbbrevTable()
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info = b.info.Bytes()
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binary.LittleEndian.PutUint32(info, uint32(len(info)-4))
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loc = b.loc.Bytes()
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return
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}
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